Math Problem Statement

assume that x and y are both differentiable functions of t. find dy/dt when x=5, and dx/dt=6 given the equation x(x)+y=3

Solution

We are given the equation x(x)+y=3x(x) + y = 3 and need to find dydt\frac{dy}{dt} when x=5x = 5 and dxdt=6\frac{dx}{dt} = 6.

Step 1: Rewrite the equation.

The equation can be simplified as: x2+y=3x^2 + y = 3

Step 2: Implicit differentiation with respect to tt.

Since both xx and yy are functions of tt, we differentiate both sides of the equation with respect to tt.

Differentiating x2+y=3x^2 + y = 3: ddt(x2)+ddt(y)=ddt(3)\frac{d}{dt}(x^2) + \frac{d}{dt}(y) = \frac{d}{dt}(3) This gives: 2xdxdt+dydt=02x \cdot \frac{dx}{dt} + \frac{dy}{dt} = 0

Step 3: Solve for dydt\frac{dy}{dt}.

Rearrange the equation to isolate dydt\frac{dy}{dt}: dydt=2xdxdt\frac{dy}{dt} = -2x \cdot \frac{dx}{dt}

Step 4: Substitute the given values.

We are given x=5x = 5 and dxdt=6\frac{dx}{dt} = 6. Plug these values into the equation: dydt=2(5)6=60\frac{dy}{dt} = -2(5) \cdot 6 = -60

Thus, dydt=60\frac{dy}{dt} = -60.

Would you like more details or have any questions?

Here are five related questions:

  1. How does implicit differentiation work for more complex equations?
  2. What is the role of the chain rule in implicit differentiation?
  3. How do you apply implicit differentiation when there are multiple variables?
  4. Can you explain why ddt(3)=0\frac{d}{dt}(3) = 0?
  5. How would this change if yy were a more complex function of tt?

Tip: Always check if the variables in an equation are functions of another variable when differentiating, as this might require implicit differentiation.

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Math Problem Analysis

Mathematical Concepts

Implicit Differentiation
Differentiable Functions
Chain Rule

Formulas

Implicit Differentiation: d/dt(f(x)) = f'(x) * dx/dt
d/dt(x^2 + y = 3) -> 2x * dx/dt + dy/dt = 0

Theorems

Chain Rule in Calculus

Suitable Grade Level

Grades 10-12